test_sdr_preexisting.js

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// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-

// This Source Code Form is subject to the terms of the Mozilla Public

// License, v. 2.0. If a copy of the MPL was not distributed with this

// file, You can obtain one at http://mozilla.org/MPL/2.0/.

"use strict";

// Tests that the SDR implementation is able to decrypt strings encrypted using

// a preexisting NSS key database. Creating the database is straight-forward:

// simply run Firefox (or xpcshell) and encrypt something using

// nsISecretDecoderRing (e.g. by saving a password or directly using the

// interface). The resulting key4.db file (in the profile directory) now

// contains the private key used to encrypt the data.

function run_test() {

  const keyDBName = "key4.db";

  let profile = do_get_profile();

  let keyDBFile = do_get_file(`test_sdr_preexisting/${keyDBName}`);

  keyDBFile.copyTo(profile, keyDBName);

  let sdr = Cc["@mozilla.org/security/sdr;1"].getService(

    Ci.nsISecretDecoderRing

);

  let testcases = [

    // a full padding block

      ciphertext:

        "MDoEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECGeDHwVfyFqzBBAYvqMq/kDMsrARVNdC1C8d",

      plaintext: "password",

},

    // 7 bytes of padding

      ciphertext:

        "MDIEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECCAzLDVmYG2/BAh3IoIsMmT8dQ==",

      plaintext: "a",

},

    // 6 bytes of padding

      ciphertext:

        "MDIEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECPN8zlZzn8FdBAiu2acpT8UHsg==",

      plaintext: "bb",

},

    // 1 byte of padding

      ciphertext:

        "MDIEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECD5px1eMKkJQBAgUPp35GlrDvQ==",

      plaintext: "!seven!",

},

    // 2 bytes of padding

      ciphertext:

        "MDIEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECMh0hLtKDyUdBAixw9UZsMt+vA==",

      plaintext: "sixsix",

},

    // long plaintext requiring more than two blocks

      ciphertext:

        "MFoEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECDRX1qi+/FX1BDATFIcIneQjvBuq3wdFxzllJt2VtUD69ACdOKAXH3eA87oHDvuHqOeCDwRy4UzoG5s=",

      plaintext: "thisismuchlongerandsotakesupmultipleblocks",

},

    // this differs from the previous ciphertext by one bit and demonstrates

    // that this implementation does not enforce message integrity

      ciphertext:

        "MFoEEPgAAAAAAAAAAAAAAAAAAAEwFAYIKoZIhvcNAwcECDRX1qi+/FX1BDAbFIcIneQjvBuq3wdFxzllJt2VtUD69ACdOKAXH3eA87oHDvuHqOeCDwRy4UzoG5s=",

      plaintext: "nnLbuwLRkhlongerandsotakesupmultipleblocks",

},

];

  for (let testcase of testcases) {

    let decrypted = sdr.decryptString(testcase.ciphertext);

    equal(

      decrypted,

      testcase.plaintext,

      "decrypted ciphertext should match expected plaintext"

);